Subway Map Application?

I tried adding a large picture of the NYC subway map to my photos but when you try to zoom in it becomes very blurry. I also tried to use a bunch of pictures of the map cut up into pieces but it doesn't work well because its not orderly.

Is there an any application that would be helpful for viewing the NYC subway maps? Thanks

What i did was download a PDF of the and threw it into PDFviewer. I helped a lot of other people jailbreak their iPods and install all of it. One person complained about having the entire map split up into 9 images and said the images came out blurry when they zoomed in... so i just did what i said above